✦ LIBER ✦

On perturbations of the spectrum of unitary operators

✍ Scribed by N. K. Nikol'skii

Publisher: SP MAIK Nauka/Interperiodica
Year: 1969
Tongue: English
Weight: 315 KB
Volume: 5
Category: Article
ISSN: 0001-4346
DOI: 10.1007/bf01388629

No coin nor oath required. For personal study only.

📜 SIMILAR VOLUMES

Unitary point spectrum of almost unitary

Unitary point spectrum of almost unitary operators

✍ N. G. Makarov 📂 Article 📅 1984 🏛 Springer US 🌐 English ⚖ 238 KB

One-dimensional perturbations of singula

One-dimensional perturbations of singular unitary operators

✍ V. V. Kapustin 📂 Article 📅 1998 🏛 Springer US 🌐 English ⚖ 209 KB

Triangular representations of operators

Triangular representations of operators with unitary spectrum

✍ N. I. Baranov; M. S. Brodskii 📂 Article 📅 1982 🏛 Springer US 🌐 English ⚖ 137 KB

Unitary transformations with the unitary

Unitary transformations with the unitary operators depending on projection operators

✍ N. F. Stepanov 📂 Article 📅 1981 🏛 John Wiley and Sons 🌐 English ⚖ 478 KB

## Abstract Unitary transformations of operators and variables are considered for those cases when a Hermitian operator in the expression **U** = exp (__i__**S**) explicitly depends on the projection operators. Some simple examples of such transformations are given and the equations obtained which

Problem of the triangular representation

Problem of the triangular representation of operators with a unitary spectrum

✍ N. I. Baranov 📂 Article 📅 1990 🏛 Springer US 🌐 English ⚖ 204 KB

Stability of the essential spectrum of o

Stability of the essential spectrum of operators close to a unitary operator

✍ N. G. Makarov 📂 Article 📅 1983 🏛 Springer US 🌐 English ⚖ 163 KB